Step-4

Title: Equivalent expressions

Grade: 1400-a Lesson: S1-L5

Explanation: Hello Students, time to practice and review the steps for the problem.

Lesson Steps

Step Type Explanation Answer

1

Problem

Simplify the expression \$((2x^3y^2)(-3xy^4)^2) / (6x^4y^3)^2\$.

2

Step

Given expression is

\$((2x^3y^2)(-3xy^4)^2) / (6x^4y^3)^2\$

3

Hint

First, let’s simplify each part individually

\$(2x^3y^2) = 2x^3y^2\$

\$(- 3xy^4)^2 = (-3)^2 times (x)^2 times (y^4)^2 = 9x^2y^8\$

\$(6x^4y^3)^2 = (6)^2 times (x^4)^2 times (y^3)^2 = 36x^8y^6\$

4

Step

Now plug these values back into the expression

\$((2x^3y^2)(9x^2y^8) )/ (36x^8y^6)\$

5

Step

Combine like terms by multiplying coefficients and adding exponents of variables

\$(2 times 9 times x^3 times x^2 times y^2 times y^8) / (36 times x^8 times y^6)\$

\$(18x^5y^10) / (36x^8y^6)\$

\$(x^5y^10) / (2x^8y^6)\$

6

Step

After simplification

\$(1/2) times (x^5 / x^8) times (y^10 / y^6)\$

\$(1/2) times x^(5 - 8) times y^(10 - 6)\$

\$(1/2) times x^(- 3) times y^4\$

\$(1/2) times y^4 / x^3\$

7

Step

Therefore, the simplified expression is \$(1/2) times y^4 / x^3\$.

8

Choice.A

Option A inaccurately presents \$−(y^4)/(2x^3)\$, due to the inclusion of a negative sign, rendering it incorrect

\$ - y^4 / (2x^3)\$

9

Choice.B

It simplifies to \$y^3/(2x^2)\$, differing from our derived simplified form, thus incorrect

\$ y^3 / (2x^2)\$

10

Choice.C

Correct: It precisely performs the calculations with accuracy

\$ (1/2) times y^4 / (x^3)\$

11

Choice.D

\$−(y^3)/(2x^2)\$, is invalid as it diverges from the simplified expression due to calculation errors

\$ (- y^3) / (2x^2)\$

12

Answer

Option

C

13

Sumup

Can you summarize what you’ve understood in the above steps?


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